Double-Parameter In-Situ Sensor Using Waveguide Grating
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Solution Overview
Problem
Existing sensors struggle to accurately measure multiple parameters, such as temperature and sound, simultaneously in extreme environments like high-temperature and high-pressure conditions, due to cross-sensitivity issues and limited sensitivity of traditional structures.
Innovation Solution
A double-parameter in-situ sensor based on waveguide grating is developed, featuring parallel straight optical waveguides with Bragg gratings and a micro air groove, allowing for independent temperature and sound sensing with high sensitivity and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single structure is used to sense multiple parameters, then device complexity is reduced, but cross-sensitivity phenomena occur making accurate measurement difficult
Solution Approach 1:
The sensor is divided into two independent waveguide structures: a first waveguide for temperature sensing with a first Bragg grating, and a second waveguide for acoustic sensing with a Fabry-Perot cavity. This segmentation eliminates cross-sensitivity between parameters while maintaining a compact integrated design.
Solution Approach 2:
Each waveguide is designed with specific local characteristics: the first waveguide has a first Bragg grating optimized for temperature sensing, while the second waveguide has a Fabry-Perot cavity optimized for acoustic sensing. This local optimization ensures that each structure is tailored to its specific sensing function without interference from the other.
2Ease of manufacture
If traditional Fabry-Perot interferometer structure is used with fiber end face reflection, then manufacturing is simpler, but sensing sensitivity is poor and cannot satisfy acoustic signal measurement demand
Solution Approach 1:
The sensor transitions from using fiber end face reflection to using a Fabry-Perot cavity structure with specific reflectivity requirements. The second Bragg grating and third Bragg grating are designed with reflectivity greater than 60%, creating a Fabry-Perot cavity that provides high sensing sensitivity for acoustic signals while maintaining manufacturability through waveguide-based fabrication.
3Adaptability or versatility
If sensors are used in high-temperature and high-pressure environments, then application versatility is improved, but material stress mismatch and reliability issues occur
Solution Approach 1:
The sensor uses composite material structures with different waveguide sections having specific material properties. The first waveguide and second waveguide are designed with appropriate material compositions that can withstand high-temperature and high-pressure environments, with the first Bragg grating and Fabry-Perot cavity structures optimized for their respective sensing functions under extreme conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The sensor achieves time-space synchronous in-situ measurement of temperature and sound with improved precision, maintaining high reliability under high-temperature and high-pressure conditions without cross-coupling issues.
Implementation Method 1
a first Bragg grating is arranged on the first straight optical waveguide, a second Bragg grating and a third Bragg grating are separately arranged on the second straight optical waveguide
Implementation Method 2
the sound sensor prepared based on the Fabry-Perot interference cavity is a research hotspot in recent years
Implementation Method 3
a first straight optical waveguide and a second straight optical waveguide are arranged in the optical waveguide substrate in parallel
Data Source
AI summary
The invention relates to the field of sensing technology, and discloses a double-parameter in-situ sensor based on waveguide grating, a sensing system and a preparation method. The sensor comprises an optical waveguide substrate, wherein a first straight optical waveguide and a second straight optical waveguide are arranged in the optical waveguide substrate in parallel, two ends of first straight optical waveguide are respectively connected with a first transmission fiber and a second transmission fiber, two ends of second straight optical waveguide are respectively connected with a third transmission fiber and a fourth transmission fiber, a first Bragg grating is arranged on the first straight optical waveguide, a second Bragg grating and a third Bragg grating are separately arranged on the second straight optical waveguide, a micro air groove is arranged on the upper surface of optical waveguide substrate, positioned between the second Bragg grating and the third Bragg grating.